Etymology: Bidens: derived from Latin bis, "twice," and dens, "tooth," hence meaning "2-toothed" and referring to the bristles on the achenes
Plants: erect, annual, 8"-48" tall, mostly smooth forb
Leaves: stalked, 3-5 pinnately-divided into lance-like, toothed, pointed leaflets
Flowers: head with an orange to greenish-brown disk 1/3" wide, usually without rays, 5-9 leafy bracts usually longer than the disk; inflorescence a few long-stalked heads; blooms June-Oct.
Fruits: flat, brown to black, often hairy with 2-barbed awns
Habitat: wet to moist; disturbed areas
Conservation Status: Native

Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 1, Wetland Indicator = FACW USDA Plants Database: Federal Distribution and detailed information including photos Dan Tenaglia's The Missouri Flora: Fabulous photographs; detailed descriptions; color and leave arrangement key. Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada" Illinois Wildflowers: Wonderful photographs; detailed descriptions; color and leaf arrangement key